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Perspective (geometry)

About: Perspective (geometry) is a research topic. Over the lifetime, 277 publications have been published within this topic receiving 5795 citations. The topic is also known as: perspective (geometry).


Papers
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Journal ArticleDOI
TL;DR: Wang et al. as mentioned in this paper proposed a perspective-preserving warping for image stitching, which spatially combines local projective transformations and similarity transformation, and gradually extrapolates the local projectionive transformations of the overlapping regions into the non-overlapping regions, and thus the final warping can smoothly change from projective to similarity.
Abstract: Image stitching algorithms often adopt the global transformation, such as homography, and work well for planar scenes or parallax free camera motions. However, these conditions are easily violated in practice. With casual camera motions, variable taken views, large depth change, or complex structures, it is a challenging task for stitching these images. The global transformation model often provides dreadful stitching results, such as misalignments or projective distortions, especially perspective distortion. To this end, we suggest a perspective-preserving warping for image stitching, which spatially combines local projective transformations and similarity transformation. By weighted combination scheme, our approach gradually extrapolates the local projective transformations of the overlapping regions into the non-overlapping regions, and thus the final warping can smoothly change from projective to similarity. The proposed method can provide satisfactory alignment accuracy as well as reduce the projective distortions and maintain the multi-perspective view. Experiments on a variety of challenging images confirm the efficiency of the approach.

4 citations

Journal ArticleDOI
17 Nov 2017
TL;DR: In this article, an analysis of the effect of projective transformations of the scenic space in a parametric environment is presented, where the metamorphosis of the space triggers changeable processes of perception.
Abstract: This study focuses on an analysis of perceiving the infinite “solid images” derived from the projective transformations of space in a relief perspective, with particular reference to Renaissance theatre scenery. Today it is possible to simulate the projective transformations of the scenic space in a parametric environment, dynamically. This parameterization allows to analyze the effects of visual perception of the scene, through the dynamic control of its projective transformations. The main objective of this study is the exploration of the places of the projective transformation straddling reality and illusion, where the metamorphosis of the space triggers changeable processes of perception. changeable processes of perception.

4 citations

Journal ArticleDOI
01 Jan 2007-Frequenz
TL;DR: In this article, different configurations of notch antennas on finite ground plane are analyzed from a modal point of view, and the filtering effect due to the interaction between the resonances of the notch and the ground plane is explained with the information provided by the current distribution of characteristic modes, and their associated eigenvalues.
Abstract: In this paper different configurations of notch antennas on finite ground plane are going to be analyzed from a modal point of view. The filtering effect due to the interaction between the resonances of the notch and the ground plane is going to be explained with the information provided by the current distribution of characteristic modes, and their associated eigenvalues. Using a doubly notched radiating ground plane with two excitation ports, the undesired filtering effect is reduced, and the antenna matching is improved. Index Terms – Modal analysis, characteristic modes, notch antennas, radiating ground plane

4 citations

Proceedings ArticleDOI
TL;DR: Geometrically, it is interesting that program source can be converted automatically to a sequence of perspective transformations and conditional jumps, though the product of homogeneous transformations with normalisation can be non-associative.
Abstract: The perspex machine arose from the unification of the Turing machine with projective geometry The original, constructive proof used four special, perspective transformations to implement the Turing machine in projective geometry These four transformations are now generalised and applied in a compiler, implemented in Pop11, that converts a subset of the C programming language into perspexes This is interesting both from a geometrical and a computational point of view Geometrically, it is interesting that program source can be converted automatically to a sequence of perspective transformations and conditional jumps, though we find that the product of homogeneous transformations with normalisation can be non-associative Computationally, it is interesting that program source can be compiled for a Reduced Instruction Set Computer (RISC), the perspex machine, that is a Single Instruction, Zero Exception (SIZE) computer

4 citations

Patent
02 Jun 1988
TL;DR: In this paper, a CCD camera is mounted so as to be pivotable about a transverse axis running parallel to the central plane of the lens, so that the image plane can always be adjusted in such a way that the object plane, lens plane and image plane intersect, as a result of which distortions of perspective may be compensated.
Abstract: The invention relates to a CCD-camera, in which the sensor is mounted so as to be pivotable about a transverse axis running parallel to the central plane of the lens, so that the image plane can always be adjusted in such a way that the object plane, lens plane and image plane intersect, as a result of which a CCD-camera can be realised in which distortions of perspective may be compensated.

4 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202110
20204
201910
201813
201712
20167